Before you can use the automatic invoice rounding function, you must set up rounding rules.
Open the Currencies window.
Click General Ledger, Setup, General, Currencies.
Fill in the Invoice Rounding Precision and Invoice Rounding Type fields. These fields are not included in the standard layout, but they can be inserted with the Design facilities. For Help about a specific field, click the field and press F1.
Setting Up G/L Accounts for Rounding Differences
Setting Up Rounding Rules for Local Currency
Specifying G/L Rounding Accounts for Posting Groups
Activating the Invoice Rounding Function